Re: [Qgis-user] Newbie question

[Tiago Tomé]

Not sure if I'm understanding your question.

If you have shapefiles, you can delete any column you wish. And add any
column you wish. Using the identify function (what I'm guessing you mean by
information cursor) simply retrieves every field contained in the table for
that feature. Also, the lat and long retrieved and displayed by that tool
are not being gathered from the attribute table, they are what QGIS calls
"derived data".

On Tue, Feb 13, 2018 at 4:30 AM, Richard Duivenvoorde 
wrote:

> On 13-02-18 03:49, John Glass wrote:
> > Apologies ahead of time. Searched for the answer, but was unable to find.
> >
> > I want to edit the fields in an attribute table (US Census /places/
> > shapefile) as some are not necessary for my map. I suspect that there
> > are some that are mandatory for the /information/ cursor to correctly
> > identify the place. Which fields might those be? Clearly they are the
> > long/lat fields and the name of the place, but what others are required
> > for the additional field data I want to add to be displayed?
>
> Hi John,
>
> If I'm correct you have data, and you want to throw away attributes?
>
> Normally you can throw away what you want. Depending on the type of data
> you have, you normally have either one column holding the Geometry
> (Point, Polygon or Line) most often in Binary Form. OR (in case of a csv
> dataset, you have indeed an x and y column). But besides that you can
> have 1 or more optional attributes (I even think it is possible to have
> None attributes).
>
> Also depending on the type of data you have, there are often some
> auxillary files (sometimes an index file, or a file containing
> projection info etc)
>
> The proof is in the eating :-) Just try.
>
> Regards,
>
> Richard Duivenvoorde
>
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Re: [Qgis-user] Versioned editing in QGIS

[alfredogarciaw]

I was trained 18 years ago on SmallWorld GIS.
 At that time Smallworld had a database technology with versioning
capability called VMDS (Version Managed Data Store) and was unique at that
time. 
Versioning, allows multiple revisions of the data without duplicating all
the data, or requiring different databases to be created. As data Versioning
showed to be very important, other vendors like ESRI-Arcgis implemented
their own versioning system, with some similarities and differences.

 But to be concise: The concept of Version is analogous to the concept that
has of drawing in a plane of paper. The creation of a version is analogous
to the process of making a photocopy of the parent version. But once the
photocopy is created the modifications in the original are NOT transferred
to the copy and vice versa. The only way to transfer the changes between two
different versions, is through the "POST" function. In the case of
SmallWorld, it also has a “MERGE” function to transfer the changes between
two different versions.

SmallWorld VMDS (Version Managed Data Store), allowed also checkpoints, so
you could go back to a checkpoint state of the data inside a version
(usually history related, like a log.).
I have been investigating spatial data versioning, for almost 2 decades.

PostGIS/PostgreSQL does not handle data versioning like SmallWorld VMDS.
But, thanks to new improvements in Postgres engine, I was able to create a
Qgis plugin that integrates with Postgres-Postgis database and allows
spatial data versioning, user security administration and project
management.
https://plugins.qgis.org/plugins/FastVersion/






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[Qgis-user] qgis.appimage

[Dpto Catastro Topografia MuniSantaCruz]

Hi every one, i understand the Qgis proyect will release a Qgis.appimage
version. Can somebody talk about that? , if it is true i am wainting so
long ago
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[Qgis-user] Two days left for submitting abstracts to FOSS4G 2018 (Dar Es Salaam)

[Tim Sutton]

Hi all

I am forwarding this email on behalf of Maria Brovelli, Academic chair for the 
upcoming FOSS4G 2018 conference in Dar Es Salaam. The conference dates are as 
follows:

27, 28 AUGUST 2018 : WORKSHOPS
29, 30, 31 AUGUST 2018 : THREE DAY MAIN CONFERENCE
1, 2 SEPTEMBER 2018 : CODE SPRINTS AND COMMUNITY EVENTS

(Note that the next QGIS User Meeting will be held in conjunction with the 
conference, probably before the event, we will confirm the arrangements soon).


If you are working in an academic context, note that the call for academic 
papers is closing in 2 days - see Maria’s message below for details:


The deadline for submitting abstracts to the Academic Track of FOSS4G 2018 
(http://2018.foss4g.org/) is approaching (15 February 2018!)

At this first step you have to submit an abstract written in English comprising 
500‐800 words and containing sufficient details for evaluation (including the 
approach, results, concepts, reasons why it should be considered and why it 
would be interesting for the audience).

The contributions are accepted on the abstract blind review process. Submitted 
abstracts will be refereed for quality, originality and relevance by the 
Scientific Committee. Authors will receive feedback and suggestions for 
improvement to their papers to be submitted in a second step for publication in 
the International Archives of Photogrammetry and Remote Sensing (listed in the 
ISI Conference Proceedings Citation Index (CPCI) of the Web of Science, SCOPUS, 
the E/I Compendex,and the Directory of Open Access Journals (DOAJ)).

For submitting your abstract go to http://2018.foss4g.org/call-for-papers.html 
and follow the instructions.

We are looking forward to receiving your contribution and see you in Dar!

Maria and Ally Hassan on behalf of the Local Organising Committee.

IMPORTANT DATES
Abstract Submission deadline is 15 February 2018
Abstract  acceptance notice is 15 March 2018
Early Bird Registration closes 15 May 2018
Camera ready paper for the Proceedings has to be submitted by 30 April 2018


Regards

Tim
—







Tim Sutton

Co-founder: Kartoza
Project chair: QGIS.org

Visit http://kartoza.com  to find out about open source:

Desktop GIS programming services
Geospatial web development
GIS Training
Consulting Services

Skype: timlinux
IRC: timlinux on #qgis at freenode.net



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Re: [Qgis-user] Web Feature Service - Feature Limit Error

[Richard McDonnell]

Hi,
When you select the data, dont cache it. I have a large datsset which I 
access regularly via WFS, when I had the Cache Layer ticked, it produced 
issues like you describe, removing the Cache requirement at the Layer 
insertion point, sorted this. Dont worry about Loading too much data, as 
you can limit this in your styling, also bear in mind, that the WFS uses 
does not load the whole dataset every time, only the view you currently 
have.

Hope that makes sense!
Regards,

Richard.


On 13/02/2018 14:15, ofoers...@posteo.de wrote:

Hi Community,

why can not I set the size of the memory (Cache Settings) to be 
greater than 805696 KiB? I have enough hard disk space.
Unfortunately, I can only import a limited number when I load WFS. For 
larger numbers (from 450.000), I get an empty layer and I get the 
Error Message:


"Download of features for layer fis:s_wfs_alkis_gebaeudeflaechen 
failed or partially failed: empty response: Unknown error. You may 
attempt reloading the layer with F5"


I have some pictures attached.

Thanks for any informations.


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Re: [QGIS-it-user] QGIS e

[Totò]

pcav wrote
> Probabilmente perché restituisce una geomertycollection?

SI, la query restituisce una geomertycollection cioè:
facendo un check della geometria ho due record; polygon e multipolygon;

come scritto sopra, Furieri ha spiegato che basti creare un altro campo
geom2 e popolarlo forzando, come tipologia di geometria, multipolygon.

saluti



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Re: [QGIS-it-user] QGIS e

[Paolo Cavallini]

Probabilmente perché restituisce una geomertycollection?

Il 13 febbraio 2018 16:28:01 CET, "Totò"  ha scritto:
>Totò wrote
>> select COMUNE,st_intersection (clc.geom, com.geom) as geom, count
>(*)as
>> nro,
>> (sum (st_area( st_intersection (clc.geom,
>com.geom)))/st_area(com.geom))
>> as
>> indice
>> from  CLC_Molise clc, comuni_molise com 
>> where  liv_3 like 'Boschi %' and st_intersects (clc.geom, com.geom) =
>1
>> group by 1
>> order by indice desc;
>> 
>> QGIS vede la tabella e il campo geom2 (MULTIPOLYGON) ma non
>visualizza,
>> nel
>> canvas, tutte le feature nonostante la tabella degli attributi sia
>> corretta,
>> cioè il numero atteso di righe è corretto ma le geometrie che
>visualizza
>> non
>> sono corrette.
>
>Ho apportato una modifica alla query, eccola:
>
>select COMUNE,st_union(st_intersection (clc.geom, com.geom)) as geom,
>count
>(*)as nro,
>(sum (st_area(st_intersection (clc.geom, com.geom))) /
>st_area(com.geom))*100.00 as indice 
>from  CLC_Molise clc, comuni_molise com 
>where  liv_3 like 'Boschi%' and st_intersects (clc.geom, com.geom) = 1
>group by 1
>order by indice desc
>
>la modifica riguardo l'aggiunta di st_union();
>questa aggiunta, dopo tutte le altre correzioni descritte sopra, rende
>visibile nel canvas tutte le geometrie.
>Credo di aver risolto! ma restano ancora dubbi: perchè i calcoli li fa
>correttamente ma non visualizzava correttamente le geometrie?
>saluti.
>
>
>
>-
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Re: [QGIS-it-user] QGIS e

[Totò]

Totò wrote
> select COMUNE,st_intersection (clc.geom, com.geom) as geom, count (*)as
> nro,
> (sum (st_area( st_intersection (clc.geom, com.geom)))/st_area(com.geom))
> as
> indice
> from  CLC_Molise clc, comuni_molise com 
> where  liv_3 like 'Boschi %' and st_intersects (clc.geom, com.geom) = 1
> group by 1
> order by indice desc;
> 
> QGIS vede la tabella e il campo geom2 (MULTIPOLYGON) ma non visualizza,
> nel
> canvas, tutte le feature nonostante la tabella degli attributi sia
> corretta,
> cioè il numero atteso di righe è corretto ma le geometrie che visualizza
> non
> sono corrette.

Ho apportato una modifica alla query, eccola:

select COMUNE,st_union(st_intersection (clc.geom, com.geom)) as geom, count
(*)as nro,
(sum (st_area(st_intersection (clc.geom, com.geom))) /
st_area(com.geom))*100.00 as indice 
from  CLC_Molise clc, comuni_molise com 
where  liv_3 like 'Boschi%' and st_intersects (clc.geom, com.geom) = 1
group by 1
order by indice desc

la modifica riguardo l'aggiunta di st_union();
questa aggiunta, dopo tutte le altre correzioni descritte sopra, rende
visibile nel canvas tutte le geometrie.
Credo di aver risolto! ma restano ancora dubbi: perchè i calcoli li fa
correttamente ma non visualizzava correttamente le geometrie?
saluti.



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Re: [Qgis-user] Zonal Statistics multiple classe

[Nikos Alexandris]

Basically I am looking to getting the total cover and percent cover 
for each class (the classes are crop data), for each polygons 
(drainage area).  So basically, how many square km of corn, forest, 
wheat... do I have in each drainage area polygons? Does that make 
more sense for you?


The modules mentioned are a perfect fit for this task.


Nicolas, if you are still on it, and didn't figure it out yet,
and you could share some sample data, I could prepare something tonight.

Nikos


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[Qgis-user] Labels visible for invisible features

[Bernhard Ströbl]

Hi all,

I have a point layer with a rule-based style based on some of the 
layer's attributes. The points are labelled using a label field.
Now, when unticking a rule in the layer panel (i.e. making the features 
falling under this rule invisible) their labels are still rendered.
Using a categorized renderer the labels are not rendered if the category 
is unticked.

Does anybody have a workaround for this?
I am using QGIS 2.18.16

Bernhard


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Re: [Qgis-user] Labels visible for invisible features

[Bernhard Ströbl]

Hi again,
I forgot to mention I have rules and subrules (3 levels of rules), 
apparently when using only rules in the top level all is working as 
expected.


Bernhard

Am 13.02.2018 um 15:33 schrieb Bernhard Ströbl:

Hi all,

I have a point layer with a rule-based style based on some of the 
layer's attributes. The points are labelled using a label field.
Now, when unticking a rule in the layer panel (i.e. making the features 
falling under this rule invisible) their labels are still rendered.
Using a categorized renderer the labels are not rendered if the category 
is unticked.

Does anybody have a workaround for this?
I am using QGIS 2.18.16

Bernhard




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[Qgis-user] Web Feature Service - Feature Limit Error

[ofoerster]

Hi Community,

why can not I set the size of the memory (Cache Settings) to be greater 
than 805696 KiB? I have enough hard disk space.
Unfortunately, I can only import a limited number when I load WFS. For 
larger numbers (from 450.000), I get an empty layer and I get the Error 
Message:


"Download of features for layer fis:s_wfs_alkis_gebaeudeflaechen failed 
or partially failed: empty response: Unknown error. You may attempt 
reloading the layer with F5"


I have some pictures attached.

Thanks for any informations.___
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Re: [Qgis-user] Zonal Statistics multiple classe

[Kirk Schmidt]

Hi Nicolas:

I would use the SAGA Raster Statistics for polygons tool which which you 
can access through the processing toolbox.




On 2/12/2018 5:38 AM, Nikos Alexandris wrote:
* Nicolas Cadieux  [2018-02-11 23:37:13 
-0500]:



Hi,
I have a raster (int16) with multiple class (ex 1 = grass, 2 = 
trees...) and a vector polygon file.  I want to have the zonal 
statistic (cum, min, max, sum...) for every class.  What is the best 
way to get this done in QGis 2.18.16 on Windows 10?


Thanks,
Nicolas


Nicolas,

not a direct answer, yet if you have access to GRASS' tools, then you 
could look

into v.rast.stats.html [0] (or even r.stats.zonal [1] if you have a
raster version of your "polygons").

If I understand correctly, you want to get statistics per polygon, not
per class. I.e., min, max, sum and the rest, for each class inside
each vector polygon.

v.rast.stats will derive the statistics in question from a raster map
for the parts covered by the vector map. Note, internally, the vector 
map is

converted to a raster.

If you have two rasters, then your base map is the "multiple classes 
map".
Your cover map will be the "rasterised vector polygons", which you 
consider as

the zones to compute the statistics in question within. Very useful,
here, is the `-r` flag: "Create reclass map with statistics as category
labels".

Nikos

[0] https://grass.osgeo.org/grass74/manuals/v.rast.stats.html
[1] https://grass.osgeo.org/grass74/manuals/r.stats.zonal.html


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